From patchwork Fri Apr 30 03:13:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Muchun Song X-Patchwork-Id: 12232183 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B865AC43462 for ; Fri, 30 Apr 2021 03:20:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DEE061446 for ; Fri, 30 Apr 2021 03:20:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230116AbhD3DVo (ORCPT ); Thu, 29 Apr 2021 23:21:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41274 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229912AbhD3DVm (ORCPT ); Thu, 29 Apr 2021 23:21:42 -0400 Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED16CC061344 for ; Thu, 29 Apr 2021 20:20:36 -0700 (PDT) Received: by mail-pf1-x42e.google.com with SMTP id i190so7953034pfc.12 for ; Thu, 29 Apr 2021 20:20:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=SoZb++zfv4yAwjnBuF75FK8ZgZmHYksA4MNIPLiTWic=; b=mlyV38kwzZqnfRIFSmO3Lzu/ptALUHfqbXSA1aV0ptvicemXcM1txUuxdvQLqZdf5l HLS765hW/rWEKW9ecF/6BtofGKaA+n6Bs2Q7DJrotWxBFrvb3JPN5oY/J6+uF8Ugu5Ns TSCmNCq1dr2/V/9bBDmHqlKirDqMgOIcfVnHBz6yqZGJdbpGkPUc89ttao4Sdg8wCZyi OZUnh72X5HlgC2/WNdIhQUrWrquMx1eeaAl9D6JbADRcEnCP9x7wvWNogDYd3LcnhZ/2 zh5ezjT+4USCuscbPhNqVcfS0nLviUGV+q9S7Q242eE37aWxeaNq+RDt+CHQP8ddxHrF dtWA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=SoZb++zfv4yAwjnBuF75FK8ZgZmHYksA4MNIPLiTWic=; b=iBr4Yl/bB5s2+VqYo1E/j5ASIdsiV4wTM7OlQJKBJ7jzOM2JgwsXzdCd87hT9uKCO/ g79r7be/ahFEIQIw3YdKI4N1FWRpVYawF/CWBBZnSpHZHwPiR6M5sV/4KSt1jUjhOi76 RTMf5MAWy542eXg6a3PWaaZW3bHKHgpU66wU829AlEI+eZj6lqjh/zI271vfK/js3tg1 FdZXK9fm83ezeQeDazQwKvSY4WkmEqHgZK+T2kdW4Op3h0MfC2UcbLgKCtmo3xXaiaKM wIxHyGIY1/l56PhwLAWZQJCXS/VhyafN3nih/MA8RHscmEqHxIrYjmJGfpqTZ7ZqcVyK gQsw== X-Gm-Message-State: AOAM532qCaTT0zMbmu1uPQKewcaoXE1arCn+1Cb+qUaVmzdS/X0/COlf Eqjf5ee1s6i81T4yoaSo7MeRFQ== X-Google-Smtp-Source: ABdhPJxmzeuvpPgk9GmyFCzB6g3eCpDFvfRsjXYrtKKIR7iA2IIslOyy4I+cKXCJ69KydA6HMKNjOQ== X-Received: by 2002:a63:575b:: with SMTP id h27mr2823285pgm.180.1619752836465; Thu, 29 Apr 2021 20:20:36 -0700 (PDT) Received: from localhost.localdomain ([139.177.225.239]) by smtp.gmail.com with ESMTPSA id t6sm405317pjl.57.2021.04.29.20.20.25 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 29 Apr 2021 20:20:36 -0700 (PDT) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, willy@infradead.org, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, naoya.horiguchi@nec.com, joao.m.martins@oracle.com Cc: duanxiongchun@bytedance.com, fam.zheng@bytedance.com, zhengqi.arch@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song , Miaohe Lin , Chen Huang , Bodeddula Balasubramaniam , Balbir Singh Subject: [PATCH v22 2/9] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Fri, 30 Apr 2021 11:13:45 +0800 Message-Id: <20210430031352.45379-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210430031352.45379-1-songmuchun@bytedance.com> References: <20210430031352.45379-1-songmuchun@bytedance.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org The option HUGETLB_PAGE_FREE_VMEMMAP allows for the freeing of some vmemmap pages associated with pre-allocated HugeTLB pages. For example, on X86_64 6 vmemmap pages of size 4KB each can be saved for each 2MB HugeTLB page. 4094 vmemmap pages of size 4KB each can be saved for each 1GB HugeTLB page. When a HugeTLB page is allocated or freed, the vmemmap array representing the range associated with the page will need to be remapped. When a page is allocated, vmemmap pages are freed after remapping. When a page is freed, previously discarded vmemmap pages must be allocated before remapping. The config option is introduced early so that supporting code can be written to depend on the option. The initial version of the code only provides support for x86-64. If config HAVE_BOOTMEM_INFO_NODE is enabled, the freeing vmemmap page code denpend on it to free vmemmap pages. Otherwise, just use free_reserved_page() to free vmemmmap pages. The routine register_page_bootmem_info() is used to register bootmem info. Therefore, make sure register_page_bootmem_info is enabled if HUGETLB_PAGE_FREE_VMEMMAP is defined. Signed-off-by: Muchun Song Reviewed-by: Oscar Salvador Acked-by: Mike Kravetz Reviewed-by: Miaohe Lin Tested-by: Chen Huang Tested-by: Bodeddula Balasubramaniam Reviewed-by: Balbir Singh --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 3aaf1d30c777..65ea58527176 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1270,7 +1270,7 @@ static struct kcore_list kcore_vsyscall; static void __init register_page_bootmem_info(void) { -#ifdef CONFIG_NUMA +#if defined(CONFIG_NUMA) || defined(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP) int i; for_each_online_node(i) diff --git a/fs/Kconfig b/fs/Kconfig index dcd9161fbeba..6ce6fdac00a3 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -240,6 +240,11 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS +config HUGETLB_PAGE_FREE_VMEMMAP + def_bool HUGETLB_PAGE + depends on X86_64 + depends on SPARSEMEM_VMEMMAP + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS